1999 GMC Sierra Classic 1500 SLT is a Truck (Extended Cab) model with 4-speed automatic transmission. This is a four wheel drive model With a power of 200 HP and 255.00 ft lbs of torque. An urban consumption is 12.00 MPG. The engine has a capacity of 5.00L with V8 cylinders. To view detailed specifications like fuel consumption and dimensions, please scroll below.